/*
 * Copyright (C) 2016  Nexell Co., Ltd.
 * Author: Sangjong, Han <hans@nexell.co.kr>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
/*
	Copyright 2001, 2002 Georges Menie (www.menie.org)
	stdarg version contributed by Christian Ettinger

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
	putchar is the only external dependency for this file,
	if you have a working putchar, leave it commented out.
	If not, uncomment the define below and
	replace outbyte(c) by your own function call.

#define putchar(c) outbyte(c)
*/

#include <stdarg.h>
#include "nx_type.h"
#include "printf.h"

static void printchar(char **str, int c)
{
	extern void DebugPutch(S8 ch);

	if (str) {
		**str = c;
		++(*str);
	} else
		(void)putchar((S8)c);
}

#define PAD_RIGHT 1
#define PAD_ZERO 2

static int prints(char **out, const char *string, int width, int pad)
{
	register int pc = 0, padchar = ' ';

	if (width > 0) {
		register int len = 0;
		register const char *ptr;
		for (ptr = string; *ptr; ++ptr)
			++len;
		if (len >= width)
			width = 0;
		else
			width -= len;
		if (pad & PAD_ZERO)
			padchar = '0';
	}
	if (!(pad & PAD_RIGHT)) {
		for (; width > 0; --width) {
			printchar(out, padchar);
			++pc;
		}
	}
	for (; *string; ++string) {
		printchar(out, *string);
		++pc;
	}
	for (; width > 0; --width) {
		printchar(out, padchar);
		++pc;
	}

	return pc;
}

#define PRINT_BUF_LEN                                                          \
	22 // 0xFFFFFFFFFFFFFFFF = 18446 74407 37095 51615 + sign bit + last
	   // '\0'
//#define PRINT_BUF_LEN 12
int getquotient(int, int);
int getremainder(int, int);
static int printi(char **out, int i, int b, int sg, int width, int pad,
		  int letbase)
{
	char print_buf[PRINT_BUF_LEN];
	register char *s;
	register int t, neg = 0, pc = 0;
	register unsigned int u = i;

	if (i == 0) {
		print_buf[0] = '0';
		print_buf[1] = '\0';
		return prints(out, print_buf, width, pad);
	}

	if (sg && b == 10 && i < 0) {
		neg = 1;
		u = -i;
	}

	s = print_buf + PRINT_BUF_LEN - 1;
	*s = '\0';

	while (u) {
		//		t = u % b;
		t = getremainder(u, b);
		if (t >= 10)
			t += letbase - '0' - 10;
		*--s = t + '0';
		//		u /= b;
		u = getquotient(u, b);
	}

	if (neg) {
		if (width && (pad & PAD_ZERO)) {
			printchar(out, '-');
			++pc;
			--width;
		} else {
			*--s = '-';
		}
	}

	return pc + prints(out, s, width, pad);
}

static int print(char **out, const char *format, va_list args)
{
	register int width, pad;
	register int pc = 0;
	char scr[2];

	for (; *format != 0; ++format) {
		if (*format == '%') {
			++format;
			width = pad = 0;
			if (*format == '\0')
				break;
			if (*format == '%')
				goto out;
			if (*format == '-') {
				++format;
				pad = PAD_RIGHT;
			}
			while (*format == '0') {
				++format;
				pad |= PAD_ZERO;
			}
			for (; *format >= '0' && *format <= '9'; ++format) {
				width *= 10;
				width += *format - '0';
			}
			if (*format == 's') {
				register char *s = va_arg(args, char *);
				pc += prints(out, s ? s : "(null)", width, pad);
				continue;
			}
			if (*format == 'd') {
				pc += printi(out, va_arg(args, int), 10, 1,
					     width, pad, 'a');
				continue;
			}
			if (*format == 'x') {
				pc += printi(out, va_arg(args, int), 16, 0,
					     width, pad, 'a');
				continue;
			}
			if (*format == 'X') {
				pc += printi(out, va_arg(args, int), 16, 0,
					     width, pad, 'A');
				continue;
			}
			if (*format == 'u') {
				pc += printi(out, va_arg(args, int), 10, 0,
					     width, pad, 'a');
				continue;
			}
			if (*format == 'c') {
				/* char are converted to int then pushed on the
				 * stack */
				scr[0] = (char)va_arg(args, int);
				scr[1] = '\0';
				pc += prints(out, scr, width, pad);
				continue;
			}
		} else {
		out:
			printchar(out, *format);
			++pc;
		}
	}
	if (out)
		**out = '\0';
	va_end(args);
	return pc;
}

int printf(const char *format, ...)
{
	va_list args;

	va_start(args, format);
	return print(0, format, args);
}

#if 0
int sprintf(char *out, const char *format, ...)
{
    va_list args;

    va_start( args, format );
    return print( &out, format, args );
}
#endif
